7. [20 points] Pirmin's Bike Shop is behind on a custom bike and needs to crash 4 hours of time from the 8-step project. The project table is given below. The critical path is ABCEFGH. Activity A B C D E F G H Normal Duration (hours) 2 3 5 3 6 1 7 10 Normal Cost ($) 10 15 25 20 30 5 35 50 Crash Duration (hours) 2 2 4 1 4 1 6 7 Crash Cost (S) 0 23 30 24 45 0 50 80 Immediate Predecessors None A B C C C,E F D,G a. What is the normal project completion time? Show all work. b. What is the normal project cost? Show all work. C. Which activities should be crashed to reach the target 4 hour crashing? By how much? Explain why. Note that more than one activity needs to be crashed. A sample answer would be: "Activity D should be crashed by two hours because activity D has one successor. Then crash activity H by two hours because it is the last activity." d. What is the project cost after crashing? Show all work.

7. [20 points] Pirmin's Bike Shop is behind on a custom bike and needs to crash 4 hours of time from the 8-step project. The project table is given below. The critical path is ABCEFGH. a. What is the normal project completion time? Show all work. b. What is the normal project cost? Show all work. c. Which activities should be crashed to reach the target 4 hour crashing? By how much? Explain why. Note that more than one activity needs to be crashed. A sample answer would be: "Activity D should be crashed by two hours because activity D has one successor. Then crash activity H by two hours because it is the last activity." d. What is the project cost after crashing? Show all work